New Orleans police are investigating a shooting and three armed robberies that occurred on Saturday and Sunday (Oct. 21 and 22).

The shooting happened Saturday about 10 p.m. in eastern New Orleans. A man was stopped in his car near the corner of Evangeline Drive and Hammond Street when three men approached and opened fire. The man in the car, 23, was shot in the right knee, police said.

On Saturday at 6:35 p.m., a man was robbed while sitting in his car in Central City, police said. The 20-year-old man was approached by two men in the 2200 block of Terpsichore Street. One of the men who approached held a gun to the man who was sitting in the car, while the other man took the victim's backpack out of the vehicle's trunk, police said.

Early Sunday morning, a man was robbed while walking in the Marigny. About 5:42 a.m., the man was walking near the corner of St. Claude Avenue and Marigny Street when he was approached by someone who demanded his property. The man complied, and the assailant fled, police said.

Later on Sunday, at 5:40 p.m., a 16-year-old was robbed in eastern New Orleans. The teen was walking near the corner of Lonely Oak Drive and Ransom Street when he was approached by another man who asked "if he smokes," police said. The man then pulled out a knife and took the teen's cell phone.

Police are searching for the suspects in all four incidents.

Anyone with information that can help solve these crimes is asked to call Crimestoppers at 504.821.1111.